Optimal time plan in accelerated degradation testing
نویسندگان
چکیده
Many highly reliable products are designed to function for years without failure. For such systems accelerated degradation testing may provide significance information about the reliability properties of system. In this paper, we propose c-optimality criterion obtaining optimal designs constant-stress tests where path follow a linear mixed effects model. The present work is mainly concerned with developing in terms time variable rather than considering an design stress which usually considered majority literature. Finally, numerical examples presented and sensitivity analysis procedures conducted evaluating robustness as well standard against misspecifications nominal values.
منابع مشابه
Optimal step-stress accelerated degradation test plan for Gamma process
Step-stress accelerated degradation test (SSADT) is a useful tool for assessing the lifetime distribution of highly reliable products (under a normal-use condition) when the available test items are very few. Recently, an optimal SSADT plan has been proposed in the literature which is based on the assumption that the underlying degradation path follows a Wiener process. However, the degradation...
متن کاملA Bayesian Optimal Design for Sequential Accelerated Degradation Testing
When optimizing an accelerated degradation testing (ADT) plan, the initial values of unknown model parameters must be pre-specified. However, it is usually difficult to obtain the exact values, since many uncertainties are embedded in these parameters. Bayesian ADT optimal design was presented to address this problem by using prior distributions to capture these uncertainties. Nevertheless, whe...
متن کاملQuantitative accelerated degradation testing: Practical approaches
The concept of accelerated testing by tracking degradation of samples over test time needs to be developed for reliability estimation. This paper aims at proposing practical approaches to conduct accelerated degradation testing on new and available used samples. For this purpose, product failure is related to a suitable physical property. Then, its failure time is defined as the expected time i...
متن کاملTesting in Nonparametric Accelerated Life Time Models
where T0 is the so-called baseline life time and T is the observable life time. We will assume that T is an absolute continuous random variable (r.v.) and that the covariate X does not depend on the time. For simplicity of presentation let X be one-dimensional. For statistical application a suitable choice of the acceleration function is important and the problem of testing ψ arises. A survey o...
متن کاملReliability Estimation based on Step-Stress Accelerated Degradation Testing by Unequal Interval Time Series Analysis
This paper proposes a reliability estimation method based on Step-Stress Accelerated Degradation Testing (SSADT) data analysis using unequal interval time series analysis. A MultiRegression Time Varying Auto-Regressive (MRTVAR) degradation time series model is proposed. Product SSADT data are treated as unequal interval composite time series and described using MRTVAR time series model and util...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications in Statistics
سال: 2022
ISSN: ['1532-415X', '0361-0926']
DOI: https://doi.org/10.1080/03610926.2022.2063892